The Young and the Restless star Eden Riegel will guest-star on Castle this season, TVGuide.com has learned exclusively.
The Daytime Emmy award-winner, 29, will play Rachel Goldstein, the distraught sister of a man killed by an antique pistol in the fourth episode of the season.
Castle taps Charmed star to play Beckett's boyfriend
Before joining the cast of Young and the Restless, Riegel won a Daytime Emmy in 2005 for playing Erica Kane's (Susan Lucci) lesbian daughter Bianca on All My Children.
The third season of Castle premieres on Monday, Sept. 20 at 10/9c.